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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9447aa4c52de35451eee0d7d5b5123eabd5e608ca998b6d127782a7ec6779423' 
  AND token = 'xJfQTMXij2M8W32js7NZNsE2dlzaYL2iUJp0CopTTl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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