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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b10af9d1fe12296878036d5cdb085b1e0062a349089e0fc3afbef1a64d44104' 
  AND token = 'jF9uypcEdSDG++V6U3pRgXWr19O2xR3OGEw+rwrxm7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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