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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5663d5f3c41dd50570e51cff5c7b757090619828788cebb6a95b2af1700d4b39' 
  AND token = '7r7K5/7qVFF0yFGD5BHM7py3QBFf5qJGr+BoCC51Ecc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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