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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1358d8ccfda8f5f2af5b6d2a6a924d8ebe41c69e8ef65101b4ebb0c75caf9346' 
  AND token = 'f62USmP/tjmqv2f9hzUIfnDhJGNgCIF78Jh8dLXh2Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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