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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e8bbdfe1a3e1953e024ccba902a56ef18f012acfa3cb34fb03d11c3000d284' 
  AND token = 'GzMvCEUmkhmI9PrOhNc1RhjLnAXrXJpFgDes1TW4kFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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