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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8ad86566e36efb6f6d4ff18d6c995dc56d4190b30d636a7d0317f29c67118d' 
  AND token = 'bKr5IVEZLWvFgh0l6g5lJ4AkesdrW4l7zX9mFwkT4Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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