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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8f5da90298b352e5575e2750cdac9e4ae6a68d7afb3ee5fa07e4f662201b0e' 
  AND token = 'iCiVlekzognOXdZ5iRBv4+hA4mAwKlcGvywDZ6exQXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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