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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ffbe9fed6885c4cfd6b44455fdabe7560439d9f217cae3f73c7a3b55cbac87e' 
  AND token = 'y6D1lRuJnE3tYPkozRZIE+Vevc+hJM+VUVOyWFJca24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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