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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531938b97254e108ea68e3c7f001bd3779d7a432e1aafc42fdf19a4cb43cecf0' 
  AND token = 'LfYHIqR/0YFffitM1r3xHFqdN0TQzdJFd2npc7+gfw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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