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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ef1c78c6321a077a9f464e1c252e5811c9b95c9124d7be9a86daaa3c1ee1ec' 
  AND token = 'wKMo6UsWzF8dv7yPWGJ8Sa+eqmzZGjczAdx5W9h/2no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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