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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfee7d65c98ac5afc86e4c9c27a73594bb29eba9bf23926d93c692e7a7a821a' 
  AND token = '0+cF1gnLpctKDEHiUCeuN06dugByEhFaDszAzv6LcAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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