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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bf738dbf7e5590969991b5832c465ebf412a8b51315f98a0e5efad7e6ca2a9' 
  AND token = '1JfeeMFc/+Zfr0QRN7EKCbMolVe+Zy9K6xkt9HqL2K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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