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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f0af002418102c83edaedec72839cf593589cb0e24dad701b27deb3e95aa80' 
  AND token = 'oNV1ize6Ah0CBD1c62ERH8mVqsjzKLPJBmp7cz9CKkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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