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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd096b7edda5441d1a7e6ddcaf673cbb822241afe8f53570d01ce57b381bffc45' 
  AND token = 'C2uIAmW020denPy7YgMWqujHUgik8vnCD3U+YIXwZT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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