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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43892f44e04e832a7251856cb5fa61b6e683a43bd079790c0c14329cbe161290' 
  AND token = '2+UcZmykCI+NxlbpzxVIjHQiyX67xXFUIzqQV/9rHe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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