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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254d36259ad20c94d552502f87f5abd6970cb38c9ffc91a4133a7ad87e0ec18a' 
  AND token = 'Mv2PNqveB/0fcyztX7cG8E/RP9WYiLUVUvoWTiDaD8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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