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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b603260809a4d389f60e5cb92507dde4bf3998b95514bda7ebde0cef335d36e3' 
  AND token = 'cHcFlAmPQRw8XkEBnQhr677KCswTECJUYHM2SXW+dwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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