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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31835d81f2ef93b67cef55d5ff854de2a55d857352085aff76f3b53f1bc7b7d8' 
  AND token = 'W2cIAWSZ2fQ0UXH3BNqnhc0cdWl/OyFBPtzkhqDl6k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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