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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c76fa64e5a6c0165c2ee2de5c0a042f852c74f177ecc877cd3c23368f5f82b6' 
  AND token = 'DV4p3rYmF56o7vTvFZ7h16DXrdKDg3mgbKwFyTirKWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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