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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33dc925f24d3d599e6ada122d9959716f340dc5019f0f572dfc45f1afab46e34' 
  AND token = 'VjBl4jGI5VqDr7GKqQyr/q31zMAh5vAAHZI4j0VMfGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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