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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0041789df64d971aa5580b610895d7f04598b0d74aa8570ba45edef28c55af1a' 
  AND token = 'pOkSnN1AzEsCEex9QfzZI1el+Pqx/ppwDFtVHyrJjys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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