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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e735b88c245312220b8f358a76d156ed43123333de8f0725c22956a32e631722' 
  AND token = '8zRT/d9vFjOBk2dP/87u+AH6Z/wgN9OOf//8LUyVLcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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