SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873da70b83e34101a764f792e6c96bf16089014ea34f2c8888b485e0b4f1156a' 
  AND token = 'dHY/un7MX7Z6vx5N+MjJlr/gTLxShacP86XJHBOylCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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