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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe9d842c7a14c3041a3c3f66461fd95df705774882b0b4fa41977a6c1d31802' 
  AND token = 'mFru+cuQjxHfvrHjYSed9Yylg3z4PAISzQO1PdhqU70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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