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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97413d1e56a1a5b652df5785197198681c0a7c8c0847a1a6db462866f6a6ac92' 
  AND token = 'ydlFIPbCqV5C9eJeu88RAyTo2bCZgv7Rja1Du+dy8mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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