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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49ea87fa0a70052cd383640089ebf879ba01de5b9dba13838b312f2eefcd278f' 
  AND token = 'A7Dt3tkNf+22hLIsVIvf+Cq7Eef5nfP6Y4SwJsqJxGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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