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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416dc5defcd63bb275daffef3206cba6543d379f3580a921ebe4ea894271cb49' 
  AND token = '3hNmORJEeFx/W8ZDwajlUQ799Cb/VhD6+El77ZET/8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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