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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ad85ade3ae1b78fec0c8c4cdfb39f2060caa655006990980974324deefd654' 
  AND token = 'qqNLrhQLFY0pAj2shW54/bzymwc00X9YQzZlR5Zjo8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}