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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d60524e76d499d06b7f397aadbe29571f317af37a08f28817d6e074aaf9a568' 
  AND token = 'PZt5BUm5jEqgrI5H8loiraQqOnWlvz4+28ZhNEAnk6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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