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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7682eb966c52374369f28a5f7cd3dd881a954c7a7053e804466d0b63446964db' 
  AND token = 'FBbsMhkHBooxErn1CoW09W2KBDGnfUXIW4GuB/B5ic8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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