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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769cf0324d5d1de548f313d5c73d7a8aeaa374302a80b0de3edbd1eadcce137c' 
  AND token = 'B6zgXeYHnjSJ8cYlMOgFjd4+p2uU5449AeR6TimQZ+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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