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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3b6714b8b8c5f81d0ab146e1408f75dacbe34e849573bf89402694c6d89887' 
  AND token = '1f77hS9apNurDESxya6GaupeaqDjj1LsdIW6sD9u7DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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