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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e62623f77403849b0ddb132aa6ccbe2f70a09667a0c7cb010a114349e54bc7' 
  AND token = 'QiRzk0QwXGiu35hYZ5xDbctxblpOXof0kdtQ7ymnKTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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