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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df9015d40382843c7d74626b2159557acb168bfa9c7d3894687351b29755980' 
  AND token = 'A1R5ZK8ew46/aiGPSeCbToN7YC2ZH0K/1SOJGqTI4kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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