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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c5837008e6440924dcc094ba85f3f629ec1cbfb1f9f0efc1da1da64998394b' 
  AND token = 'Cs0PyvJ2KK68r/AJsR4F7RICdS8QRat1F1KDZxJ6l1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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