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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb8648b5ba991327860fc821a219b91ee80772334c5ec65a735b96fd28d0ecd' 
  AND token = 'RKJpP6461vAL5ZHbwEL73Z3oOKk8yRP+9G9ZGxmY8Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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