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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17af5271170743708215a4f3c659d8852ffc00cd24964cf93cc84bcc24ac5670' 
  AND token = 'WfsALtbYl+jKDcs11++DJTG3ZolWQ1cHfyq0RrG4fKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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