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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562a7ea19aab3f679baed0a2b9e3c4a1f42c1d39d09a8610e7c228dfef524f6c' 
  AND token = 'HM2SDPBk8RUekWFVDmHYrSJCIUGIZ5xikn/6GrJhEY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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