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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62739abc57e6c35283643b4052ef0fd9417e74b3157d7df4859ad7b14f5a4258' 
  AND token = '4WSw2aT9Zkwosr3EnFuTXS81cqk3pQHTdz8sGS5AibA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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