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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b37c53c57fbd05e53c11b392ade5328014782969678957fc78031fb59cc29d' 
  AND token = 'fO7OuftXsbwFpxsXkZvLtr0WDVsW0DLa0QZKm7WmHB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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