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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f554489dde95488ab12b6df95f6ae64a0b67997b1cb31a5983b3d124fdc7ee3' 
  AND token = '6tIWwA6zOPVJVo3wkE9yy/8v2Egd+vwgQTlitAKlp0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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