SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34555567de04f41e384d7310227383c2920ca9e77b0b95d0f4a722d1fb25e8ba' 
  AND token = '+z20jVg+b3PvKdq3mNqeZQwAM0jACtLVyrzFBgleRX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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