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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a43cbfc4bf445dbe15f754b3f6b412e003008dc391e6ee33b3543fa42d0e4275' 
  AND token = '6a/7DDG1KtrX3JHpugmtGJ0IiewsFMdnsRrWv7wGZhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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