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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4832a447f0af3bd54be2ff708a94f9760f74cdebec602ea1bae25583d84bbff6' 
  AND token = 'I6CFdQah5tJcDk+uCK0FBecvP8dtalmhhmMxH6Mchg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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