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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd940a8876bdae1845410ed62e95398e86a37766bce888fcde48708e071ae5d1c' 
  AND token = 'uTofn1hyBg/6Ay42/ADEq0539QGnKnFNKpRW8odjZuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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