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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041109e0a062966a473efb8247a33beb93f00742d720bec8a747b7ae0c828ebf' 
  AND token = 'gZf8RYjeLDDQf9ZhTJvIPaMT9NtGQlfTDE7l1jlQpRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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