SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033dbf8c8fa8ce006b55e554604b1c73c300b53f998758de281bbd9ef416ec72' 
  AND token = 'EKnFLJPpTDGU7YIGlENOMjgA2Lz/dB+fYGe8i/XCVfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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